Valve-grinding device.



E, WESTMAN.

VALVE GRINDI'NG DEVICE. APPUCATIQN FILED MAR. 26. 1914'.

Patented Nov. 2, 1915.

- the above result.

s rranr amen E'IIL WESTMAN, 0F MINNEAPOLIS, MIN NESOTiA, ASSIGNOR 0F ONE-HALF TO THOMSON 'S. AMIDON, OF MINNEAPOLIS, MINNESOTA.

VALVE-GRINDING DEVICE.

Specification of Letters Patent.

Patented Nov. 2, 1915.

To all whom, it may concern Be it known that I, EMiL WESTMAN, a citizen of the United States, residing at Minne apolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful improvements in Valve-Grinding Devices; and' I do hereby declare the following to be a full, clear, and exact description of the invention, such as .will enable others skilled in the art to which it appertains to make and use the same.

My. invention has for its object to provide an improved valve grinding device, and to such ends, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

As is well known the proper movement to impart to a valve in grinding the same to its seat is an oscillatory movement back and forth, of about one-fourth rotation. Usually, this movement has been accomplished by hand, and the oscillation under such hand movement is not constant, but variable. The best grinding action requires a repetition of oscillations of constant throw, progressively shifted so that the valve, while being oscillated, is slowly rotated in one direction.

My invention provides an extremely simple and efiicient device for accomplishing In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings: Figure 1 is a view chiefly in vertical section, but with' some parts in full, showing my improved valve grinding device Fig. 2 is a horizontal section taken on the line 00 m on Fig. l; and Fig. 3 is a view partly in section and partly in elevation, and with some parts broken away, showing a valve in its seat to which the improved grinding device is adapted to be applied.

I The numeral 1 indicates a valve which be assumed to be the admission or exhaust valve of an explosive engine, and the numeral 2 indicates its cooperating seat against which it is to be ground and seated. Valves of this type, while being ground, are usually spring-pressed upward, so that when the downward pressure thereon is relieved, they will raise from their seat, but

the spring for this purpose is not illustrated, because the action is well'understood. Also, valves of this type are usually provided in their outer hubs with slots to which a tool 3 of the screw driving type, may be detachably applied for the purpose of oscillating the valve and grinding.

The improved grinding device comprises a casing which is preferably made in two sections 4 and 5, detachably connected by ma chine screws 6. The sections of this casing are provided with axially alined sleeve-like hubs 7, and the upper case section 5 is provided with an offset sleeve-like hub 8. A suitable hand piece, preferably in the form of a wheel rim 9 is applied to the casing and, asshown, is cast integral with the lower case section 4.- Extended through and journaled in the lower hub 7 is an oscillatory shaft 10 provided at its upper end within the casing, with a short crank arm 11, and provided at its lower end with a clutch head 12 adapted to detachably hold a screw drive 3.

Extended through and journaled in the upper hub 7 is an operating shaft 13 provided at its lower end, Within the casing with a spur pinion 14: that meshes with a spur gear 15 secured to a short upright shaft 16, journaled in a hub 8. This gear 15 carries an eccentrically located wrist pin 17 that is connected by a short pitman or connecting rod 18, and a wrist pin 19 on the end of the crank arm 11. The ends of the shafts 10 and 13 are reduced and project toward each other, as shown, in Fig. 1, and an anti friction bearing ball 20 is interposed-between the said reduced shaft ends. This ball 20 is held in position by a sleeve 21 telescoped over the reduced ends of said shafts l0 and 13. The ball is thus caged in working position, so that it transmitsthe end thrust from the shaft 10 to the shaft 13 by contact at the axis of the said shafts, and hence, offers but slight friction.

Rotary movement may be imparted to the driving shaft 13 either by power, such as would be afi'orded by an electric motor, for example, or it may be imparted by hand applied to an operating crank 22 secured to the upper end of the said shaft.

When the pinion 14 is rotated. by means of the crank 22, the gear 15 and its wrist pin 17 will be rotated at a relatively slow speed, and the throw of the wrist pin or crank 17 is such that the crank arm 11 and tool by taking hold of the crank 22 with his other hand; and by slowly rotating the tool, while the crank shaft is being rotated, may slowly rotate the valve while it. is being given its back and forth oscillatory movement. I

In actual practice, this'improved valve grinding tool has been found highly efficient for the purposes had in view, and it has been found that by the use of the same, not only is the labor and time required to grind valves, very greatly reduced,

but better work can be done.

WhatI claim is: 1. In a valve grinding device, the combination with a casing, of a driving shaft and a'tool-equipped driven shaft journaled to said casing in axial alinement, the former said tool-equipped shaft having a crank di rectly secured to its inner end and provided with a wrist pin, and a second gear within said casing journaled thereto, and meshing with said first noted gear and provided with a crank pin, and a crank rod-directly connected to said-wrist pin and crank pin and working within said casing.

2. In a valve grinding device, the combination with a casing, of a driving shaft and a tool-equipped shaft journaled to said casing and-axially alined with each other, a gear on said driving shaft, a crank arm on said tool-equipped shaft, a second gearjournaled to said casing, meshing with said first gear, and provided with 'a wrist 'pin, a

crank rod connecting said wrist pin to saidmeshing with the first gear, and a crank and connecting said crank gear to said crank, whereby said tool-equipped shaft will be oscillated when said driving shaft is rotated, the said casing having a pro- 7 jecting wheel flange affording a hand piece.

4. Inja valve grinding device, the combination with a casing and a driving shaft andfa tool-equipped shaft, of a gear on the ,former, a crank on the latter, a crank gear meshing with the first gear, and a crank having a spur gear at its inner end, and a rod' connecting said crank gear to saidcrank, crank directly applied to 1ts outer end, and

whereby said tool-equipped shaft will be oscillated when said driving shaft is rotated, the said casing being made in two sections separable to afford access to the interior thereof, but normally rigidly connected together, one of the sections of said casing having a projecting wheel flange affording a hand piece. p

In testimony whereof I affix my signature in presence of two witnesses. A Y

EMIL WESTMAN,

lVitnesses:

B. G; WHEELER, HARRY D. KILGORE. 

